Dougle lift shedding motion



June 25, 1956 H. STAUBL! ETAL DOUBLE LIFT SHEDDING MOTION 6 Sheets-Sheet 1 Filed June 24, 1953 llll u une 2%, 1955 H. s-rAuBu Erm- ZJELQ-E DOUBLE LIFT SHEDDING MOTION Filed June 24, 1953 6 Sheets-Sheet 2 June 26, 1956 STAUBU HAL 2,751,938

DIOUBLE LIFT SHEDDING MOTION Filed June 24. 1953 6 Sheets-Sheet 3 DOUBLE LIFT SHEDDING MOTION 6 Sheets-Sheet 4 Filed June 24, 1953 June 1956 H. sTAuBu ETAL DOUBLE LIFT SHEDDING MOTION 6 Sheets-Sheet 5 Filed June 2 1953 June 26, 1956 H- STAUBL, HAL 2,751,938

DOUBLE LIFT SHEDDING MOTION Filed June 24, 1955 '6 Sheets-Sheet 6 United States Patent DOUBLE LIFT SHEDDING MOTION Hugo Stiiubli, Horgen, and Walter Wicker, Oberrieden, Switzerland, assignors to Gebr. Stiiubli & Co., Horgen, Switzerland Application June 24, 1953, Serial No. 363,865

Claims priority, application Switzerland September 2, 1952 3 Claims. (Cl. 139=-68) The present invention relates to a double lift shedding motion in which, by means of suitable controlling devices, an endless pattern card of Verdol paper or similar thin material is used for controlling the drawhooks in order to bring them into the path of the lifting knives. It is desirable for a double lift shedding motion to be capable of running backwards, i. e. to pick out the weft in the right sequence by turning the shedding motion backwards; in other words if there is any fault in the fabric, it should be possible to weave backwards until the faulty pick lies in the open shed. If e. g. after twenty picks, a faulty pick in the 15th is discovered, it should be possible to turn the loom backwards in order to open the 20th shed and to take out the weft, then continuing the backward motion, the shed of the 19th pick is opened, then that of the 18th and so on until the shed of the 15th pick is reached and the weft concerned can be taken out. After this process, it should be possible to restart the forward motion of the loom in order to continue weaving. In case of double lift shedding motions that, as it is known, have two lifting knives or in case of double lift shedding motion with positive heald lifting device, two pairs of lifting knives, one of the knives or pair of knives lifts by means of drawhooks the healds for the even picks, whereas the other knife or pair of knives actuates the healds for the odd picks. The drawhooks are brought into and out of the path of the knives in either direction at the very moment when the knives are in their home position and as soon as the hooks have been set free. At that moment, the hooks have to be brought into such a position that they are either taken along by the knife or free of the latter in order not to be taken along; in other words, the healds are raised or remain in the lower shed as prescribed by the pattern card. The raising of the pattern card takes place by suitable means, determining the position of the hooks by means of intermediary members. Reading devices are known that allow a weaving backwards in the right sequence of the pick.

The present invention simplifies to a certain extent the already existing reading devices or removes disadvantages, characteristic to all former devices, such as the puncturing of the pattern card of Verdol paper. This invention relates to those double lift dobbies in which the movement of the pattern card of Verdol paper by two picks each time, takes place every second pick during the so-called lost motion, i. e. at the moment when one of the lifting knives or pair of knives is in a position to assure play between hooks and knife in order to enable the hooks to be controlled. According to the present invention, the shedding motion for controlling the hooks, provides for three reading needles per heald shaft, reading the pattern card as soon as the feeding of the latter is carried out and two driving bars, coacting with push needles, the latter actuating hook needles or suitable lifters, so that by means of rising bars, associated either to the hook needles or by direct motion,,the hooks are brought into or out of the path of the lifting knives,

7, 2,751,938 Patented June 26, 1956 whereby the hooks which coact with the knife or pair of knives, in the lost motion of which the cylinder movement takes place, are associated with only one reading needle per hook and with a single driving bar and the hooks which coact together with the other knife or pair of knives are associated with two reading needles and one driving bar with recesses and that this driving bar is submitted, apart from the lateral pushing movement in the direction of the needle, to a longitudinal toand-fro movement, whereby the recesses in the driving bar occur at regular intervals corresponding to the lateral distances of the hooks and the extent of the toand-fro movement corresponds to half the distance between two recesses.

The attached drawings give three constructional examples of the present invention:

Fig. 1 shows a vertical section on line IIll in Fig. 2 of the first constructional example of a double lift shedding motion with positive heald lifting device.

Fig. 2 shows a front view of Fig. l in which individual parts have been left out for reasons of clearness.

Fig. 3 shows a side view of the device according to Figs. 1 and 2.

Figs. 4 and 5 show a schematic side view of the second and third constructional example of a double lift shedding motion and Fig. 6 finally shows the working diagram of the double lift shedding motion according to the first constructional example.

The present double lift shedding motion has frames 1 and 2 in which shaft 3 is supported. On shaft 3, swing levers 4 are placed in order to be capable of rocking. On pivots 5 of the swing levers 4, bars 6 are linked which lead to the lifting levers and the heald shafts which are not shown in the present drawing.

The baulk levers 8 are mounted so as to be capable of rocking on pivots 7 of the swing levers 4. The baulk levers are provided on both ends with double hooks 9 or 19 respectively. Double book 9 coacts together with the upper pair of knives 11, 12, double book 10 with the lower pair of knives 13, 14. Two rods 15 and 16, displaceable parallel to themselves and extending over the whole width of this shedding motion may coact together with hooks 9 and 10, so as to press them against the knives 12 or 14 respectively. Rod 15 is supported by a pair of levers 17 and rod 16 by a pair of levers 18, and the pairs of levers 17 and 18 rock on the fixed shaft 19 or 20. Rollers 21 or 22 on the pairs of levers 17 and 18 roll on cam discs 23 on each side of the frames 1 or 2, while the cam discs 23 are mounted on shaft 24 of the shedding motion. A draw spring 25 supports the levers 17 and 18 with the rollers 21 and 22, pressing them against the circumference of cam discs 23. The surface of abutment 26 or 27 respectively on double hooks 9 and 10 may coact together with lever 28 or 29, mounted so as to be capable of rocking on shafts 30 and 31 respectively, subject to the influence of draw springs 32 or 33 respectively. These springs endeavour to press levers 28 and 29 with their surfaces of abutment 34 or 35 against the fixed stop rail 36 or 37.

The two stop rails 36 and 37 support toothed ledges 38 and 39 respectively in the recess of which push needles 40 or 41 and 42 are guided. Push needles 40 carry reading needles 43; push needles 41 carry reading needles 45 and push needles 42 reading needles 44. Push needles 40 and 41 coact together with push bar 46 and push needle 42 together with push bar 47. Push bars 46 and 47 are capable of a to-and-fro movement on rollers 48 or 49 respectively. Push bar 46 supports a toothed rail 50 with recesses at regular intervals, the distance of which is equal to the distance between two adjacent hooks and equal to the double distance between push needles 40 and 41. Push bar 47 is 3 provided with a full rib 51. Push bars 46 and 47 are connected by bar'52 or53'resp'e'ctivelywith swing lever 54 or 55 which in order to be capable of rocking are mounted on shaft v.56, supported by the frames. The lower end of swing-lever '54 supports two rollers 57 and '58, the axis of which being at right angles to each'other'and the rollers running on the circumference or on the lateral side respectively of cam disc '59 on ashaft 6%). Swing lever 55 supports roller 61, running on cam disc 62 on shaft 69. Spring 63 presses rollers 57 and '61 against cam disc 59 or 62.

Push needles 40 and 41 rest on across bar 64 and push needles'42 on a crossbar 5.4.

The'bars-64'and'65 are supported by arms'66 which are held at point67 and mounted so as to be capable of rocking on arms 68, fixed on shaft 56. Shaft 56 is provided. with a lever 69 (Figs. 2 and '3), supporting a roller 7i pressed by means of a springTl against a cam disc '72 on shaft'il.

Cam disc 72 is provided witha pin 73 which effects the movement of ratchet 'wheel74 for pattern card cylinder 75. The pattern card cylinder 75 is placed on shaft 76 and carries pattern card 77. Certain parts in Fig. 2 have been omitted in order to givea better view of the other parts.

According to Fig. 3, .knife 11 is mounted at both ends on each lever 78, whereby levers 73 are placed so as to be capable of rocking on shaft '79, mounted on frames land 2. 'A guiding bar 31 gripsbolt'fidof lever 78 and is linked at the other end with a bolt SZ-of alever 83. Lever 83 is placed so as to be capable of rocking on shaft 84, mounted on the two frames 1 and 2, and thereby supports a roller 85 which runs in groove $6 of curved disc 87.

7 Knife 12 is fixed on each side of the frames 1 and 2 to levers 88 and the latter areplaced in order to be capable of rocking on shaft 79. Aguiding bar 90 connects a ivot 91 on'lever 83 with apivot 92 on a lever 93. Lever 93, mounted so as to be capable of rocking on shaft 84, supports roller which runs in groove '96 of curved disc 3'7,

placed on shaft 24.

Knife'13 is fixed on each side of the frames 1 and 2 to levers 97 and rocks with these levers 97 on shaft hfiof the loom and,shaft 24 transmits its rotation on to shaft 64 not described herein. r The operation of the described shedding motion is as follows:

Pattern card 77 is read by three reading needles 43, 4d and 45 per heald shaft, whereby reading needles 43 and 45 read the even picks and needles 44 the odd picks. The raising of healds for the odd picks is operated by the lower pairs of knives 13 and 14 and the raising of healds for the even picks'by the upper pairs of knives 11 and 12.

According to the present invention, as regards the lower pairsof knives, at the moment when the hooks are set free by the knives, the hookslhave to be brought into or out of the ath of the knives in such a manner that in the for ward motion of the loom those hooks responsible for the raising of healds for the 13th pick, for example, must be taken along by the knife and in the backward motion of the loom those which are responsible for the raising of healdsfor the .11th pick. The same refers to the-upper pattern card 77, the movement of the cylinder is half-finished, driving bars 46 and-47 are in their ultimate lcftposition, so that in 'the continued turning of theishedding motion in one sense or't'he other, push needles 40, 41 and 42 drop on driving bar 46 or 47 in front of the toothed rail 50 or rib 51 respectively and must therefore be carried along 'withth'em. This corresponds'to the position of At 280 in the backward motion, the push bar starts 7 in the diagram of Fig. 6. In the latter, the motional diagrams are designated by the same figures as the corresponding arts of the machine. Curve A shows the movement of needle supports '64 and 65, curve B the cylinder movement and curve C the lateraldisplacement of push bar 46. When the machine is then turned forwards, the

' cylinder movement is completely accomplished, so that for instance the new picks, I12, 13 and 14 can be read. The reading process is accomplished at 1 60. Driving bar 47 for the lower hooks 10 starts working at having therefore actuated'push needles 42"on'lever 2?, so that the corresponding hooks 10 are taken 'along'by knife 13,

which starts working'at In the backward motion of the machine, the hooks taken along by the lower pair of knives for e. g. the IBthpick are released at 190. Shaft 1.6 for the lower hooks releases all books of the knife 13. At 160 the withdrawing-of the reading needles begins, so that between 130 and 110, the cylinder is turned backwards and thus 'e. g. the-picks 10, 11 and 12 can 'be read. The reading process finishes at 80 and push bar 47 starts working, so that by means of push needles 42, the

hooks of the 11th pick-are taken along by the lower air of knives, which starts working at 50. Regarding the even picks, actuated by the upper pair of knives 11, 12,

the procedure is asfollowszatdOO i. e. in the middle of the position of the knives in which hooks 9 were set free,

the reading needles read picks 12 and 14, so that by means of the movement of push bar 46which'starts working at as in the backward motion of the machine, push bar 46 V is longitudinally displaced in such a manner that at280 its position is such that push-needles 49 which support reading needles 43, having read'the 12th pick, are actuated.

working, so that at 230 the corresponding hooks are brought into the path of the knives. In the forward motion, the push bar is put into action at 320, so that at 10 the hooks are taken along-by the knife and the shedbackward motion of the machine, are broughtinto the V path of the corresponding knives.

The double lift shedding motion describedherewith and given as an example in Figs. 13 is meant for double lift shedding motions with positive'heald lifting deviceand therefore shows twopairs of knives.

The control of the hooks according to the-present in-: vention is also applicable to double liftshedding motions.

as schematically shown in Figs. 4 and 5. 7

According to Fig. 4, three reading needles 182. 102

and 102" which are controlled by the paper on the at tern cylinder 103, influence three push needles 104,104 and 164", one of which workson lifter hooks 105 and two on lifter hook 166 which are biased toward said push needles by springs 105' and 106 respectively. .Lifter books 105 and 106 actuate, by means of hook needles 107, hooks 108 which coact together wi'th'knives 1'99; in order to turn the swingjlever 11'0, therebyraising the heald shaftattached .to the'latter.

Push bars ll'land I12 actuate push needles in the required sense for forward or backward motion of the machine, i. e. push bar 111 again is a toothed bar with recesses at intervals, equal to twice the distance between the two push needles 104 and 194". When reading needles 1G2 and 102" drop into holes, one or the other of the push needles 104' or 104" is moved by means of a tooth of push bar 111. The reading needle 102 however, when dropping is always displaced by the rib of push bar 112.

According to Fig. 5, there are three reading needles 113, 113 and 113", actuating the three push needles 314, 114 and 114 which on their side coact together with two hook needles 115 and 115, Hooks 116, according to their control, are brought by hook needles H5 and 115 into the path of the knives 117 in order to actuate swing lever 118 and in consequence the healds, not shown.

The displacement of push neetfles 114' and 114 is carried out by means of push bar 119, having teeth 119 at intervals equal to twice the distance between the needles 114 and 114". Push needle 114 may be worked by push bar 120 by means of a rib 120'. Springs 123, E23 and 123" act respectively on push needles 114, 114 and 114" urging them toward their respective push bars. in order to raise the hook needles, the raising bars 121 and 2122 are provided. Apart from this, the working of this device is the same as that given in Fig. 4.

Having now particularly described and ascertained the nature of our said invention and in what manner the same is to be performed, we declare that what we claim is:

l. in a double lift shedding motion for a loom, a plurality of swing levers, means for connecting each of said swing levers to a heald, a pair of hooks connected with each of said levers, movable knives engageable with said hooks to impart movement to said hooks, levers and healds and means for controlling the engagement of said hooks with said knives comprising means for feeding a pattern card periodically every second pick during idle motion of said knives, a group of three push needles fo each heald, means connecting one needle of each of said groups to one of said hooks associated with the respective heald to control the engagement of said hook with a cooperating knife, means connecting the remaining two push needles of each group with the other of said hooks associated with the respective heald to control the engagement of said latter hook with a cooperating knife, push bars movable laterally of themselves to push said push needles, a reading needle carried by each of said push needles and engageable with the pattern card to position said push needles selectively in or out of position to be engaged by said push bars depending on the pattern, said push bar cooperating with said remaining two push needles for each heald having recesses at intervals equal to twice the distance between said push needles and means for shifting said last mentioned push bar longitudinally between a position in which it engages alternate ones only of said push needles, intervening push needles coinciding with said recesses, and a position in which it engages said intervening push needles only.

2. A shedding motion according to claim 1, in which said hooks are double-ended and a pair of knives cooperates with each hook.

3. In a double lift shedding motion, a series of draw hooks, means connecting said draw hooks with corresponding healds, a laterally movable knife engageable with said draw hooks and means for controlling the engagement of said draw hooks with said knife comprising two push needles connected with each of said draw hooks, a laterally movable push bar engageable with said push needles to actuate said needles, a reading needle carried by each of said push needles and engageable with a pattern card to position said push needles selectively in or out of osition to be engaged by said push bar depending on the pattern, said push bar having recesses at intervals equal to twice the distance between said push needles and means for shifting said push bar longitudinally between a position for engaging alternate ones only of said push needles, intervening push needles coinciding with said recesses, and a position for engaging said intervening push needles only.

References Cited in the file of this patent UNITED STATES PATENTS 1,672,434 Staubli June 5, 1928 

